235/45R21
Standard MetricFactory Specs, Physical Dimensions & Compatible Vehicle Applications
Factory Spec Overview
The 235/45R21 tire size features an overall diameter of 29.33 inches, a section width of 9.3 inches (235mm), and rotates 688 times per mile. It is a standard factory tire fitment on 7+ vehicle models including Audi Q4 e-tron, Audi Q4 e-tron Sportback.
Physical Dimensions & Specs
Overall Diameter
29.33"
745.0 mmSection Width
235 mm
9.25" wideSidewall Height
4.16"
105.7 mm (45% aspect)Revolutions / Mile
688
Circumference: 92.13"Rim Diameter
21"
Wheel sizeRecommended Rim Width
5.9" - 8.2"
Optimal rim width rangeSpeedometer & Alternate Size Calculator
Testing an alternate size for your vehicle? Compare 235/45R21 against any proposed tire size below:
Popular Comparisons:
Tire 1 (Stock / Base)235/45R21
Overall Height:29.3"
Sidewall:4.2"
Revs/Mile:688
Tire 2 (New / Compare)245/60R18
Overall Height:29.6"
Sidewall:5.8"
Revs/Mile:682
Visual Tire & Wheel Comparison
Speedometer Variance
+0.8%At 60 mph reading, actual speed is 60.5 mph
| Indicated | Actual Speed | Diff |
|---|---|---|
| 20 mph | 20.2 mph | +0.2 mph |
| 30 mph | 30.3 mph | +0.3 mph |
| 45 mph | 45.4 mph | +0.4 mph |
| 60 mph | 60.5 mph | +0.5 mph |
| 75 mph | 75.6 mph | +0.6 mph |
| 90 mph | 90.8 mph | +0.8 mph |
Fender & Suspension Clearance
Fitment Status: MODERATE RISK
Flush fitment. Extends 17.7mm outwards. Check wheel arch clearance under full suspension compression.
Inner Strut Space:7.7mm LESS clearance
Outer Fender Push:Extends 17.7mm further out
Ride Height Delta:+0.12" ground clearance
Vehicles That Fit 235/45R21 (7+ Models)
Factory standard and optional vehicle fitments utilizing 235/45R21 tires: